Jeffrey,
You're technically correct that the "(c)" isn't sufficient under the language of the Copyright Act. However, at least one court opinion suggested that it might essentially be "close enough."
http://scholar.google.com/scholar_case?case=14347707357763137205&q=copyright+symbol+circle&hl=en&as_sdt=2,48

The prevalence of free, open WiFi has made it rather easy for a WiFi eavesdropper to steal your identity cookie for the websites you visit while you're connected to that WiFi access point. This is something I talked about in Breaking the Web's Cookie Jar. It's difficult to fix without making ma...